Electronic Device

4. The electronic device according to claim 2, wherein the fourth antenna comprises a first matching circuit configured to eliminate a current signal coupled from at least one of the first antenna and the third antenna in the closed state, and an input end of the first matching circuit is connected to a body of the fourth antenna and an output end of the first matching circuit is grounded.

5. The electronic device according to claim 4, wherein the first matching circuit comprises an LC filter circuit.

6. The electronic device according to claim 5, wherein the LC filter circuit comprises an inductor having an inductance of 24 to 30 nH and a capacitor having a capacitance of 0.2 to 0.3 PF.

7. The electronic device according to claim 4, wherein the second antenna comprises a second matching circuit configured to eliminate a current signal coupled from at least one of the first antenna and the third antenna in the closed state, and an input end of the second matching circuit is connected to a body of the second antenna and an output end of the second matching circuit is grounded.

9. The electronic device according to claim 8, wherein the plurality of the matching branches comprise a capacitor branch having a preset capacitor with a capacitance greater than a preset capacitance.

10. The electronic device according to claim 9, wherein the switch has a fully open state where all of the plurality of the matching branches are connected to the body of the second antenna, and an equivalent capacitance of the plurality of the matching branches is greater than the preset capacitance.

11. The electronic device according to claim 8, wherein one of the plurality of matching branches is configured to optimize at least one of the first antenna and the third antenna, and the rest of the plurality of matching branches are configured to adjust a working frequency band of the second antenna.

12. The electronic device according to claim 8, wherein the switch is selected from a single-pole multi-throw switch, a relay, a transistor and a switch circuit with multiple outputs.

13. The electronic device according to claim 8, wherein the plurality of the matching branches comprises at least one selected from a resistor branch, an inductor branch, a capacitor branch, and an impedance circuit formed by at least two of a resistor, an inductor, and a capacitor.

15. The electronic device according to claim 1, wherein the second L-shaped radiating section is opposite to a second end of the lateral radiating section away from the second feeding point; the second L-shaped radiating section, the T-shaped radiating section and the main housing together define a strip-shaped slot; and the second L-shaped radiating section, the T-shaped radiating section and the main housing form the third antenna.

18. The electronic device according to claim 1, wherein a width of the groove is equal to a width of the first slot in the first antenna; and a depth of the groove is smaller than a depth of the first slot in the first antenna; a width direction of the groove is parallel to an extension direction of a frame where the first antenna and the second antenna are located, and a depth direction of the groove is perpendicular to the extension direction of the frame where the first antenna and the second antenna are located.